# How do I add colour to this set of nodes?

I'm attempting to create a sort of starry effect using nodes. However, I can't seem to be able to add colour to it. This is the following node setup:

And this is the result:

This is essentially three layers of noise textures. One on its own, and two modified with wave textures, to create different densities, and to add a cloudy effect. Unfortunately, this is all black and white, and I'd like to control the colour of each 'layer' of noise textures.

Changing the colours in any of the ColorRamp nodes has not helped. Setting random colours to any of these nodes simply controls brightness. Adding a MixRGB node before the Math nodes at any point seems to achieve the same result, or no change at all.

How can I add some colour to this?